You scribbled down something, you didn't understand at all what Mr.Rengoku tried to teach the class, it was math who would understand math? Exactly no one!

"I see you're rather bored here, making doodles in your exercise book"

Surprised you look up at him with wide eyes, growing red from embarrassment at being caught

"If you don't understand something then just ask, I am here to teach and help you after all"